Glkynoch



NIIED Starts arm Erica eEoneE Irrnoon, or WITTON, NEAR BIRMINGHAM, coUNrYoE STAFFORD,

ENGLAND.

ARTRlDGE-SHELL.

SPECIFICATION forming part of Letters Patent N0.298,696, dated May 13, 1884.

Application filed January 9. 1882. (No model.) Patented in England November 1, 188i, No. 4,776.

To mZZ whom it may concern:

Be it known that I, GEORGE KYNoon, a citizen of England, residing at WVitton, near Birmingham, in the county of Stafford, England, have invented a new and useful Improvement in Cartridge-Gases, (for which I have applied for Letters Patent in Great Britain, bearing date November 1, 1881. No. 4,776,) of which the following is a specification.

metallic cartridge-cases in such a manner as to secure great soundness and durability consist ently with great lightness of material and economy of manufacture.

The construction which I will describe applies to cartridge-cases, whether for sporting or for military purposes, as I will explain, referring to the accompanying drawings.

Of these Figures 1, 2, 3, 4:, and 5 relate to a common form of case'for sporting-cartridges, and Figs. 6, 7, 8,9, and 10 to a well-known form of case for military cartridges.

For cartridge-cases of other forms and pro portions a like construction is applicable, as

2 may be readily understood.

I make the cartridge-case in two parts. the tube andthe head but instead of making the tube, as in manykinds of composite cartridgecases, without a bottom, or with a hole through its bottom, and then securing it to the head by pulp or otherwise, I make the tube, by drawing in the ordinary way,with a complete bottom indented with a recess to receive the inwardly projecting percussionchamber of 3 5 the head. Figs. 1 and6 show in longitudinal section the tube thus prepared. As the head,

' which I will presently describe, strengthens the bottom, I do not require to make the bottom of the drawn tube itself of considerable 4o thickness relatively to the tube, and consequently, as the tube is of nearly uniform thick ness throughout its whole substance, I am enabled to draw it very thin without exposing any parts of it to unequal strains. I prepare,

5 by punching and drawing, a cup-such as those shown in Figs. 2 and 7 which cup is to form the head of the cartridge-case, and which has formed in it the inwardly-projecting percussion-chamber. Having prepared the tube, as

My invention relates to the construction of shown in Figs. 1 and 6, and the cup, as shown in Figs. 2 and 7, Iinsert the bottom of the tube into the cup, as shown in Figs. 3 and 8, and I then subject the two together to drawing and heading pressure, so as to give the finished form shown in Figs. 4 and-9, the cup being by this operation soundly united to the tube. Holes are then pierced, as shown by the plans, Figs.

5 and 10, for passage of flame from the percussion-cap into the charge, and the case is complete, ready for charging. The finished cartridge-case thus manufactured,without requiring any internal lining, presents a strong double bottom, consisting of the inner thin bottom, which is of one piece with the tube, and of the outer thicker bottom,.which is sufficiently strong to sustain the percussion, and which has the usual projecting lip. or flange for extraction. As the inner bottom is in one piece with the tube, there is no joint at the angles of the bottom liable to produce fracture or to permit escape of powder-gas.

Heretofore a metallic cartridge-case having a closed end with a central depression in the latter has been provided with a "cap, also formed with a central depression, the said cap being fitted on the closed end of the case,with an elastic disk intervening between the closed end of the case and the cap. It will be seen, however, that I dispense with the interposed disk which prevents a close union between the case and the cap, the latter being made by me of accurately the same configuration as the base or closed end of the case; also, after fitting on the cap, the two are subjected to drawing and heading pressure, whereby the parts unite, so as to practically form one shell but in the instance where the interposed disk is employed the cap must, to give it a firm hold on the case, be subjected to compression, such as will reduce the diameter both of the cap and the base of the tubular shell.

Having thus described the nature of my invention and the best means I know of carry ing it-out in practice, I claim The improvement in the art of manufacturing cartridgeshells, which consists in making the shell or tube with a completebottom having a central recess and applying thereto an external flanged heztd provided with an inwardly- I In testimony whereof Ihave signed my name proj eating nipple, forming the percussion tothis specificati011,i11 the presence of two sub- 10 chamber, and then subj eeting the parts thus scribing witnesses, this 18th day of November, connected to a drawing and heading pressure, A. D. 1881.

5 whereby the cap is made to closely fit the con- GEO. KYNOOH.

figuration of the bottom of the tube or shell WVitnesses: and the two parts are intimately united with M10. P. M. MILLARD,

each other, substantially as described. H HAROLD IMRAY. 

